Add Attribute to Referenced Characteristic

Hi mates,

I created a Characteristic Info Object BGAN with Reference to 0GL_ACCOUNT.

Then, I further loaded this Info Object with Data from BILKT table of R/3.

Now, I intend to add 1 navigational attribute to this BGAN Info Object, but it doesn`t seem to allow me

" <i>You can only maintain display attributes with referenced chararact. 0GL_ACCOUNT</i> "

Please advice if I can still add another navigational attribute 0CS_ITEM to this BGAN Characteristic.